OpenStax College Physics 3 28 45 If the rest energies of a

# Openstax college physics 3 28 45 if the rest energies

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OpenStax College Physics Chapters 26-31 3. (28-45) If the rest energies of a proton and a neutron (the two constituents of nuclei) are 938.3 and 939.6 MeV respectively, what is the difference in their masses in kilograms? Solution kg 10 2.3 m/s 10 3.00 J/MeV 10 1.60 MeV 938.3 MeV 939.6 30 2 8 13 2 2 0 2 0 c E m mc E mc E To two digits since the difference in rest mass energies is found to two digits. 4. (29-42) (a) Calculate the momentum of a photon having a wavelength of μm 50 . 2 . (b) Find the velocity of an electron having the same momentum. (c) What is the kinetic energy of the electron, and how does it compare with that of the photon? Solution (a) kgm/s 10 2.65 m 10 2.50 Js 10 6.63 28 6 34 λ h p λ (b) m/s 291 kg 10 9.11 kgm/s 10 2.652 31 28 e e e e e e m p v v m p (c)   6 20 8 28 26 2 2 31 2 10 2.06 KE J; 10 7.96 m/s 10 00 . 3 kgm/s 10 2.652 J 10 3.86 m/s 10 2.911 kg 10 9.11 0.5 2 1 KE e γ γ γ e e E c p E mv 5. (30-15) What is the smallest-wavelength line in the Balmer series? Is it in the visible part of the spectrum?

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• Fall '18
• Afrifa
• Energy, Mass, OpenStax College Physics, m , d 2.5 10

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